Improvement in safety-valve devices



W. H. STANTON. SAFETY VALVE DEVICE.

Patented Mav 14, 1867.

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WILLIAM H. STANTON, OF DUNMORE, PENNSYLVANIA.

Letters Patent No. 64,720, dated 14, 1867.

IMPROVEMENT IN SAFETY-VALVE DEVICES.

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TO ALL WHOM IT MAY GONCERN:

Bcit known that I, WILLIAM H. STANTON, of Dunmore, in the county of .buzerne, and State of Pennsylvania, have inventeda new and improved Steam and Liquid Pressure Regulator; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art'to make and use the same, reference being had to the accompanying drawings,'forming part of this specification.

This invention relates to a method of regulating the action of the safety-valve on steam boilers and of valves on other vessels containing liquid under pressure; and the invention consists in arranging a cylinder" and piston and other appliances and controlling the piston in such a manner that being connected with the safety ralre lever, and operated by steam from the boiler, thesafety-valve shall be opened or closed by the pressure of the steam on the piston in the manner hereinafter described.

Figure 1 represents a central vertical section of my device, through thelineyy of fig. 9-.

Figure 2 is a horizontal section through the line are, fig. 1.

Similar letters of reference indicate corresponding parts.

A represents the cylinder, 13 the piston in the cylinder. C is a channel for the passe-gee! steam, which is in communication with the upper portion of the cylinder and with the boiler at all times. This channel extends under the cylinder, as seen in the drawing, and is there designated by D. E is the piston-rod, having a cross-bar, F, on its upper end by which the pistonis connected with the safety-valve by rods seen in red lines in the drawing. The pipewhich conveys the steam from the boiler to the cylinder is also seen in red lines connected with the channel 0 at G. a is an aperture through the cylinder to admit steam to the upper side of the piston, where, as before stated, the pressure of thesteam from the boiler is constant. b-is an aperture from the lower channel D for the admission of steam into the lower end of the cylinder or .to the under side of the piston. C is another aperture through the cylinder for the discharge of steam from the under side of the piston. J is a piston or plunger which works back and forth, opening and closing the apertures 15 and c according to the pressure of the steam upon it. That pressure is resisted and counteracted when thepiston is under ordinary pressure by a spiral spring, K, which is governed in its tension or power by a set-screw, m, which passes through a. gland-nut which closes the channel 1). The'steam which is discharged from the cylinder through the aperture, finds its way out of the channel D through a hole, i, seen through the spring K in the drawing.

The operation will at once be understood by those at all acquainted with the steam engine. The position of the plunger, as seen in the drawing, would indicate that there was the desired pressure of steam in the boiler. Should the pressure be increased and the-plunger J be forced back against the spring, uucovcring the aperture 6, then steam would rush into the cylinder, and there would be immediately an equilibrium of pressure above and below the piston. The pressure being thus taken from the safcty-valve lever the valve would open and let off steam until the pressure was diminished. When this diminution took place the power of the spring K would force the plunger J forward again, covering the aperture 12 and opening 0, when things would remain as they were before until another over-pressure occurred. It requires something more sensitive than the ordinary weighted lever in common use to insure the proper and secure working of the steam safety-valve; and this arrangement is designed to secure the desired object.

' Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. The combination of the piston Bin the cylinder, steam channels C D opening into the cylinder at a above the piston and at b 0 below the piston, piston J, spring K, and set-screw m, substantially as described for the purpose specified.

2. I claim the plunger J, the spring K, the channels C D, the apertures ab 0, and the set-screw n1, arranged and operating substantially as described, in combination with the cylinder and the piston, for the purposes set forth.

WM. H. STANTON.

Witnesses:

P. I. CONYNE, 'JAnns Huenns. 

